Результаты поиска по 'nonautonomous systems':
Найдено статей: 2
  1. Yakovenko G.N.
    Reasons for nonlinearity: globality and noncommutativity
    Computer Research and Modeling, 2009, v. 1, no. 4, pp. 355-358

    A dynamic process modeled by ordinary differential equations is considered. If a nonautonomous system of ordinary differential equations has a general solution in a certain area, than the system can be simplified by nonautonomous substitution of variables: right parts turn to zeroes. Right parts of an autonomous system of ordinary differential equations in the neighborhood of nonsingular points can be linearized. A separable system where the right part contains linear combination of autonomous vector fields and factors are functions of independent variable is considered. If the fields commute than they can be linearized by general substitution of variables.

    Keywords: nonlinearity, nonautonomous systems, dynamic processes.
    Views (last year): 3.
  2. Zubanov A.M., Kutruhin N.N., Shirkov P.D.
    Constructing of linearly implicit schemes which are LN-equivalent to implicit Runge–Kutta methods
    Computer Research and Modeling, 2012, v. 4, no. 3, pp. 483-496

    New family of linearly implicit schemes are presented. This family allows to obtain methods which are equivalent to stiffly accurate implicit Runge–Kutta schemes (such as RadauIIA and LobattoIIIC) on nonautonomous linear problems. Notion of LN-equivalence of schemes is introduced. Order conditions and stability conditions of such methods are obtained with the use of media for computer symbolic calculations. Some examples of new schemes have been constructed. Numerical studying of new method have been done with the use of classical tests for stiff problems.

    Keywords: stiff systems of ordinary differential equations, stiffly accurate Runge–Kutta methods and Rosenbrock schemes, stability and L-equivalence.
    Views (last year): 2. Citations: 2 (RSCI).

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